ALEXANDRIA, Va., Feb. 17 -- United States Patent no. 12,552,901, issued on Feb. 17, was assigned to Kureha Corp. (Tokyo).
"Polyarylene sulfide production method" was invented by Takeshi Sato (Tokyo), Mizuki Saito (Tokyo), Ken-ichi Takaki (Tokyo) and Yoshinori Suzuki (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method for producing polyarylene sulfide that can have a high melt viscosity while suppressing ultra-fine powder generation. The method for producing polyarylene sulfide includes: (1) preparing a prepared mixture containing an organic polar solvent, a sulfur source, and a dihalo aromatic compound; (2) initiating a polymerization reaction by heating the prepared mixture to produce a prepolyme...